| 摘要 |
PURPOSE: To produce an Al-Zn-Mg alloy excellent in intergranular corrosion resistance as that used as the structural material for vehicles and aircraft. CONSTITUTION: An Al-Zn-Mg aluminum alloy having a compsn. contg., by weight%, 3.0 to 8.0% Zn, 0.5 to 3.0% Mg and 0.01 to 0.5% Bi, furthermore contg. one or >= two kinds selected from among 0.1 to 3.0% Cu, 0.05 to 0.3% Ti, 0.1 to 1.5% Mn, 0.05 to 0.4% Cr, 0.05 to 0.4% Zr and 0.05 to 0.4% V, and the balance Al with inevitable impurities and excellent in intergranular corrosion resistance is obtd. Moreover, the Al-Zn-Mg aluminum alloy in which metallic Bi having 1 to 20μm grain size is dispersed at the density of 40 to 2000 pieces/mm<2> and having excellent intergranular corrosion resistance can be obtd.
|
